Hi Matthijs,
I have passed the question below on to my distributor on around Oct 26 and whilst they are attempting to assist me, I do not have a solution yet and feel I need some higher level advice on this occasion. The system is installed, it is an on-grid system, is there a way to make this work? Despite the gen set being brand new and 33KVA, it is obviously not supplying 'mains quality' power and unless I disable AS4777, the gen input will not be accepted by the Quattro's. I need to keep the AS4777 settings, can you recommend a solution?
I designed the system using the Quattro's with 2 AC inputs purposely so grid and generator could be utilised as per the Quattro data sheet and did not expect this issue. It seems to me that the selected grid code settings are applied to both AC inputs and unless they can be separated, it cannot work.
The system is in the 30-100KW category as the 15KW's of PV inverters downstream are added to the overall capacity, so I also have secondary grid protection installed by way of an external AS4777 approved protection relay (in case you were wondering about on-grid compliance).
Thanks,
Wes Corbet
Previous question:
I have recently installed a 3 Phase on-grid ESS system using 3 x Quattro 10's with back-up 33KVA 3 phase diesel Gen set. The issue I am having is the system does not accept any current from the gen set despite the gen voltage being present on the AC input 2 terminals of the Quattro's, AC In 2 being programmed for Generator in the GX (AC Input 1 is grid) and having the grid voltage, AC In 1 turned off.
I switched the 3 Quattro's to charger only with gen on and grid off, no luck there.
I tried most things suggested previously on the community also with no luck.
Whilst onsite, I did change the grid code from AS4777 to "Other Not compliant to any grid code standard", I suspected the strict grid settings for AC Input 1 (grid) might also be active for AC Input 2 (gen set) and the charging started, at least for a couple of minutes before it disconnected (grid still disconnected)
I checked the NS protection Log after it stopped charging and there was an error there referencing "ROCOF". I then took particular notice of the gen-sets frequency and it seemed to change quite quickly from 49.8Hz up to 50.4Hz.
Question, do AC input 1 and AC input 2 share the same grid settings when a country code is selected? To get my system to work correctly it would seem I need the grid compliant settings for AC Input 1 and more relaxed settings (or user configurable settings), especially frequency, for the generator on AC input 2.